"Looking at the stats for all our apps (we have 4 universal apps with almost 3 million downloads) and for all versions after a month gives an interesting picture." Close to 70% is on iOS 6 already. In the meantime, Sony just announced it's going to leave loads of users in the cold by not upgrading their phones to Jelly Bean. Those that do have an update in the pipeline will have to wait until next year.

No, the data isn't predicated on updating the app; the app, upgraded or not, reports the OS being used (the post states that the data is provided for their 4 apps, across all versions in use).

I have no idea what you mean by this is inconsistent with Google sampling methods because there is no data for Google whatsoever in the post, but everyone knows uptake of the latest Google update is objectively bad. Different methods of data collection (and visiting Google Play within a certain timeframe is a rather poor measure anyway, it shouldn't be a standard method of measuring OS adoption) isn't going to alter the enormous disparity between the 2 platforms.

No, that post says that while he was looking at data for one of his app's updates, he was taken by the rate of adoption of iOS. For the subset of those updating the one app, the adoption rate for iOS is 77%. It never states that the data in the post Thom links is only the subset of those updating the 1 app; it states the opposite. The link provided by Thom specifically states the data is across all versions of all 4 of their apps. And here we see that the adoption rate across all 4 apps and all versions is, as expected, lower but comparably high (55%-70%).

I know how Google measures OS update releases. I'm stating that its a poor measure -- Apple doesn't have to indirectly record other OEM's devices through a store. And I'm also stating that the disparity is so huge that handwaving about different methods of arriving at the results is absurd. There is no data collection method that is ever going to show Android uptake remotely close to iOS uptake.